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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 5 of 5 (0.016 seconds)Spelling suggestions: "subject:"thesfreespace""
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EMERALD ASH BORER (COLEOPTERA: BUPRESTIDAE) HOST EXPANSION; TRADING AN OPTIMAL HOST FOR ENEMY FREE SPACE?Olson, David G. 01 January 2018 (has links)
Emerald ash borer (EAB), Agrilus planipennis (Coleoptera: Buprestidae), is an aggressive invader from Asia that has killed millions of trees in North America. Recently EAB has been documented developing in a novel host, white fringetree, Chionanthus virginicus. I evaluated larval performance in two common ash species and white fringetree by infesting excised bolts with emerald ash borer eggs. In addition I evaluated several plant characteristics to determine which most influence larval development. I also conducted choice and no choice assays using the classical biological control agent, Tetrastichus planipennisi (Hymenoptera: Eulophidae), to assess its ability to locate larval EAB in the different host plants. I found significantly lower survival rates of EAB larvae in white fringetree compared to white ash, F. americana. Larval phloem consumption and larval growth were lower in fringetree than in both ash tested. In choice and no choice assays T. planipennisi failed to parasitize larvae in fringetree. Failure of T. planipennisi to parasitize larvae within fringetree has implications for the efficacy of this classical biological control agent. Coupled with the use of white fringetree as a reservoir host, the enemy free space provided to EAB through use of this alternate host may have repercussions for EAB invasion dynamics.
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LIMITATIONS OF HOST PLANT USE IN TWO ANDEAN ALTINOTE (NYMPHALIDAE, HELICONIINEA, ACRAEINI), BUTTERFLIES, FROM A TRITROPHIC PERSPECTIVE.Pedersen, Karen M. 11 May 2015 (has links)
No description available.
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Ecological significance of the environmental heterogeneity between the upper and lower surfaces of a single leaf as a determinant of acarine predator-prey relationship / 葉の上下面における環境異質性がダニの捕食-被食関係に及ぼす影響Sudo, Masaaki 24 March 2014 (has links)
Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(農学) / 甲第18312号 / 農博第2037号 / 新制||農||1020(附属図書館) / 学位論文||H26||N4819(農学部図書室) / 31170 / 京都大学大学院農学研究科地域環境科学専攻 / (主査)教授 天野 洋, 教授 田中 千尋, 教授 松浦 健二 / 学位規則第4条第1項該当
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Einfluss des Wirtswechsels der Kohlmotte, Plutella xylostella L. auf Erbsen auf ihre natürlichen Feinde in Kenia / Influence of the host shift of the diamondback moth, Plutella xylostella L. to peas on its parasitoids in KenyaRossbach, Andrea 26 January 2006 (has links)
No description available.
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To what extent do non-native shrubs support higher trophic levels?Zakroff, Ari 30 May 2023 (has links)
No description available.
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